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8: The normalized pressure inside the suggested waveguide for an incident acoustic wave of frequency 727 Hz. The pressure is estimated using the FEM (a) and (c) and the analytic network model (b) and (d). The incident excitation and the propagation direction are marked with white arrows. The incident wave is controlled to (a),(b) split between the two ducts and (c),(d) exit from the upper duct only

8: The normalized pressure inside the suggested waveguide for an incident acoustic wave of frequency 727 Hz. The pressure is estimated using the FEM (a) and (c) and the analytic network model (b) and (d). The incident excitation and the propagation direction are marked with white arrows. The incident wave is controlled to (a),(b) split between the two ducts and (c),(d) exit from the upper duct only

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Figure 1.2: Construction of the (a) unit cell and (b) structure of the...
Figure 1.3: A simple mass spring damper system.
Figure 1.4: Bode plot of the effective mass of the system shown in...
Figure 1.7: Construction of the (a) unit cell and (b)resonant modes of...
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Wave Propagation Control Using Active Acoustic Metamaterials
Thesis
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  • Apr 2017
Acoustic metamaterials (AMM) are artificial materials with engineered sub-wavelength structures that possess acoustic material properties which are not readily available in nature. The material properties of AMMs can be manipulated by embedding active elements inside their structure (active AMMs). This manipulation of properties is done by an exter...
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